<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // let a = 100
        // let b = function(){
        //     console.log('666')
        // }
        // b()
        // function fn(){
        //     console.log('666')
        // }
        // fn()
        (function(){
            console.log('888')
        })();
        (function(){
            console.log('9669')
        })()
        

    </script>
</body>
</html>